Across:
1 Pressure (P-) on paramilitaries (Ulster Freedom Fighters = -UFF-) in (-IN) (PUFFIN) flyer (PUFFIN),
4 Street (WAY-) is a great distance (-FAR-) from hospital (-ER) (WAYFARER) for one going on foot (WAYFARER),
9 One of the links (one of the links = link = TIE-) for golfers (-PIN) (TIEPIN) catches on around St Andrew, for one? (TIEPIN catches on around a St Andrew-style knotted necktie),
10 Mice pass (mice pass = ESCAPISM) contamination (= anagram indicator) to those living the dream (ESCAPISM),
12 English (E-) priest (Rev = -VER-) upsets (= reversal indicator) Olive (olive green = -GREEN) (EVERGREEN) and Laurel (laurel = EVERGREEN),
13 String (TWINE) quartet back (‘quartet’ back = T-) in The Cellar (-WINE) (TWINE),
14 That lot with stock in the parlour (DAIRY FARMERS) rewrite (= anagram indicator) diary (diary = DAIRY) by experts in The Field (FARMERS) (DAIRY FARMERS),
18 Partition (SCREEN-) is the work of the judge (WRIT-) and British monarch (Queen Elizabeth / Elizabeth Regina = -ER) (SCREENWRITER) – one needs to put words to that for a film (SCREENWRITER),
21 Some adult relations (some ‘adult relations’ = trela = ALERT) go back (= reversal indicator) on their toes? (ALERT),
22 A (A-) man (-ERIC-) overshadowed by another man? (-M-AN-) Old Bob (old bob/shilling = -S) (AMERICANS) in The Bostonians! (AMERICANS),
24 Paper (SUN-) contacts the foreign (the = -LA-) police in barracks (military police = MPs = -MPS) (SUNLAMPS) – some will be red in the face lying under these structures (SUNLAMPS),
25 Soldier (RANGER) in regiment (R-) from Red State? (-ANGER) (RANGER),
26 Serves up (= reversal indicator) Dutch cheese (Edam = MA- DE-) including port (left = -L-) off Cherbourg, for example (off Cherbourg = French ‘sea’ = MER) (MAL DE MER) – coming in waves, it’ll make you sick (MAL DE MER),
27 Composed (SERENE) newsreader releases draw (‘newsreader’ releases ‘draw’ = nesree = SERENE).
Down:
1 Bonus for the waiter (tip = PIT-) serving up (= reversal indicator) the frothy tops on stout (-HEADS) (PITHEADS) from those with access to The Black Stuff (PITHEADS),
2 French (F-) centre (centre = -RENET-C) showing off (= anagram indicator) holds first interception (first ‘interception’ = -I-) (FRENETIC) when its fast and furious (FRENETIC),
3 Sickening without Ken’s (“sickening” without “Kens” = icing = ICING) topping (ICING),
5 Not in school (ABSENT-) to look after (-MIND-) and feed half (‘feed’ half = -ED) (ABSENT-MINDED) the daydreamers (the ABSENT-MINDED),
6 Father (F-R-) consuming coffee (-LATTE-) in hospital (-ER-) (FLATTERER) tells the barista dishonestly, it’s the best cup ever (FLATTERER),
7 Raise a stink losing stake (‘raise a stink’ losing ‘stake’ = raisin = RAISIN) to wizened dried-up type (RAISIN),
8 Frenchmen (Messieurs = -MM-) in expensive (dear = RA-ED) review (= reversal indicator) (RAMMED) hit hard (RAMMED),
11 What a role model would do (SET AN EXAMPLE) for Irishman (Sean = SE- AN) over time (-T), for instance (for EXAMPLE) (SET AN EXAMPLE),
15 Cathy (Cathy= YACHT), Rocky (= anagram indicator) and Grace (Grace) lose the head (g) (‘Grace’ lost ‘g’ = RACE) (YACHT RACE) in regatta (YACHT RACE),
16 Go out in strong gale (‘go’ out in ‘strong gale’ = strngale = STRANGLE) to experience something that will take your breath away (STRANGLE),
17 Keep (PRESERVE) page (P-) from book (-RESERVE) (PRESERVE),
19 Cream (BAL-M) covers tops of strawberries and (tops of “strawberries and” = -SA-) (BALSAM) something that’s naturally fragrant and soothing (BALSAM),
20 Florentine removes trio (‘Florentine’ removes ‘trio’ = flenne = FENNEL) from herb garden (FENNEL),
23 Painting (IMAGE) of Frenchman (Monsieur = -M-) at the bar (Attorney General = -AG-) in Ireland (Ireland domain = i.e. = I-E) (IMAGE).